Automatic telephone-exchange.



A. KATZ.

AUTOMATIC TELEPHONE EXCHANGE.

APPLICATION FILED .IAN-28,19I3.

lalieutcd Feb. 22, 1916.

6 SHEETSTSHEET I.

., ,.HHNNHI .l k Y l l e; BHLUS SHEH 2y A. KATZ.

AUTOMAC TELEPHONE EXCHANGE.

MPLICAYION HLLD 1AN.Z, 1913.

o SHEETSWSHEET 4.

ne i A. KAYZ.

Patented Feb. 22, 12H0.

6 SHEETSWSHEET 5.

@rn /ci? L new? IUTOMATIC TELEPHONE EXCHANGE,

APPLICANON mw 1AN.28,1913.

lwhich Vgoes in the'desired direction` UNITED STATES PATENT OFFTCE.

ARON KATZ, OF CHARLOTTENBURG, GERMANY, ASSIGNOR TO SIEMENS & HALSKE, A. G., OF BERLIN, GERMANY, A CORPORATION 0F GERMANY.

AUTOMATIC TELEPHONE-EXCHANGE.

Specification of Letters Patent.

Patented Feb. 22, 1916.

Application tiled January 28, 1913. Serial No. 744,722.

Ainvented certain new and useful lmprovements in or for Automatic Telephone-Exchanges, of which the following is a. full, clear, and exact description, reference being had to the accompanying drawing, forming a part of this specification.

Junction lines in telephone s vstems pio vided with selectorscan be divided into two groups, namely those having di1ected and those having non-directed junction lines. To the former belong for instance the junction lines which go from a Selector group to the first thousand. second thousand, etc.; to the latter belong the junction lines which go from preselectors to first group selectors. The directed junction lines usually go from selectors; which are set by a number of impulses corresponding to that of a wanted subscriber, these number impulses being controlled by the calling subscriber;

In automatic systems hitherto used non -directed7 trunks .are usually inserted between the calling'station z'. e. subscriber or sub-exchange and the first connecting switch and between the single subsequent connecting switches respectively the number of such different switches used in series for each connection being dependent on the type and range of the exchange system. whereby said switches may be subdivided into pre-Y selectors, selectors or group selectors and connectors accordingly. T hese' non directed junctions or trunks are set independ ently of. the desired direction. This arrangement has the drawback that each of said connectingr switchesis ta-ken into use, without being certain that lover this connectingr switch a junction line can be reached Hence it is usual to insert an automatic selection after a set of impulses, this automatic selection enabling one of lOJO junction lines in the required direction to be selected. This selection from among/a comparativelyv large number of similar junctions requires con.- necting switches having man v contacts and thereby (especially during rush hours) the arms of the connecting-switches have to be.

.movedmver considerable distances, causing considerable wear and tear and also loss of time. A further disadvantage 'of this usual system of grouping is thatall the junctions going in one direction from any connecting switch may he engaged and if that is the case further connections'to be set up over these connecting switches 'in the same direction cannot be completed. and vet in other groups there are junctions in the same direci tion which are disengaged.

According to the invention the simplest I possible means are provided vfor giving each calling station access to every one of the directed junctions, and means are also provided by which the connecting switches need only have a few cont-acts and are only taken into use when it is quite certain that they can be used to extend the connection in the desired direction.

A feature of the invention is the testing arrangement ["or determining, before any of the different connecting switches is taken into use, that a junction line, outgoing from the group of connecting switchesis still available.

The connecting switches of each kind shown in the drawings can beof any contains only two lines, relays can be used as connecting switches.

ln the drawings illustrations of the in vention are shown.

Figure 1 shows diagrammatically' an arrangement of trunk lines between three sub sequent connecting switches, of which by wav of example the first may be a preselector, the second a group` selector and the third a connector, and testing means, in form of separate connecting switches associated therewith, Fig.` 2 a. modification of the arrangement of Fig. 1 having more outgoing junctions or trunk lines as incoming inthe` first group of connecting switches, Fig. 3 a modification illustrating the bunching of the trunk lines inthe different groups of connecting switches, Fig. l another modification, in which the connecting switches are. provided with three contacts each. F and G show the circuit arrangements necessary tor setting up a connection bc- 'tween two subscribers.

In the drawings single lines represent junction lines. These lines sometimes represent junctions with two leads and somtL times junctions with three leads. The number of leads depends on the type of system used for setting and testing, whether for eX- ample a three wire or loop system is used for setting the vconnecting switches and whether repeaters andregisters are used and so on. 1f such details were shown it would only confuse the main feature of the lllvention and it. is obvious in what manner the necessary speaking, testing registering release and locking circuits can be added.

Fig. 1 shows a system having 16 lines. The calling lines bear the letter u those belonging to the group V, are un u f those to group V2 Each calling line has a connecting switch, which may be a preselector and likewise bears the letter u and there is also a second connecting switch allotted to each call ing line which bears the letter te, rather called a testing switch as will be seen later on. The connecting or testing switches le are arranged in groups D.

The junction lines v, outgoing from groups V, terminate in selectors gl, g2 which are arranged in groups G G2, G, G4, each comprising four selectors. The junctions are so arranged thatthose outgoing from a V group each terminate in a diil'erent. G group. Similarly the junction lines"f 1l" outgoing from a. D group terminate in connecting switche y likewise called testing switchesY which are arranged in groups P-P the junction lines from a l) Group likewise terminating-in different 1) 2, etc., groups. The junctions 1' r, outgoing from the groups G similarly1 teirniinatc in selectors, which may be connectors and are arranged in groups L, the ju'nctions rrom a group G, as before terminating on differentgroups L L2, etc. The junctions p p, outgoing from the P groups are joined to the junctions from G to L in such a manner that those outgoing from P4 are joined to the junctions r4. rs, r,. r,G be longing to the final group L4. The lines out-going from L4 can be subscribers lines or they can be junctions going to other groups in the same exchange or other eX- change.

1f a connection is to be set up between the lines u?, and nl (Fig. l.) the calling station '1.1.2, will first, by means of four current impulses set the s\ `ector 'w24 of the group D, on to the group 1) thereby oc- Vand the testing switch y, is set on r4.

cupying the junction als. By means of the circuit shown in Fig. 5 the testing switch gs, which is allotted to the junction d, in the group P4, is coupled with the preselector u2, in the group V2, and both begin to move synchronously. Assuming now that the junctions 1.5 r6, 93 rw, arc already engaged, then after both switches have moved one step, the preselector u2, is set on junction o5 By means of the arrangement shown in Fig. 5

the switches cannot stop there, because theA preselector u2, has reached an engaged line (V5) although the junction r, is disengaged. Both switches therefore move on another step and they reach junctions 'ca and r, both of which are engaged, hence the switches take a third step.

Although the junction e, is disengaged yet the switches hare again to move on, because the junction 71 is engaged` They then reach the j unctions e.. and rpi whichare simultaneously disengaged. As soon as by this doubling testing operation at V and P a group Gm has been found, which can he reached from an available non-directed junction and which has an' outgoin r junction. rw available in the desired dlrection L4 the connecting switches come to rest and the testing switches in the groups D and P are available for other calls, this being effected in the manner shown in Fig. 5. From the calling station u2, or from any other station the selector g24 in the group Gm is now set on the line rm. The number of impulses which the connecting switch g24 receives corresponds to the desired direction 11,. The junction r1, terminates in theconnector lm which is set on the desired line tw by means of a second set of three number-impulses sent by the calling station uw The speaking lines are thus from u2, over "ai .02m Tim Zic to tw- I lt other lu and r junctions than those assumed above had been engaged, the connection might then have been set up over the group G, or G. beca-use -a pair of junctions e and r have to be found which belong to the same group and are simultaneously available. It is immaterial which groups of the selectors G G2 are used.

The arrangement according to Fig. 1 has the disadvantage that under some circumstances it would be Vpossible that the connection could not be setup although there are free junctions. When for instance the junctions v5, n, and o, are engaged, then no pair ot' junctions is free having junctions o and r belonging to the same group and simultaneously availal'ile. In order to overcome this detect the groups V allotted to the calling station u are allotted more (for instance double as many) outgoing junc-` tions as vthere are junctions incoming in the groups V. This 1s shown in Fig. 2. The

group L4. one path namely that over group G2. the

lines 'v1-'vm terminate in groups G. The junctions @1 -u32 can then go to groups G having twice as many selectors as the groups V preselectors. But instead of this there could be twice as many groups G as there are groups V and then each of these groups would have only as many selectors as the group V preselectors.- In any case the groups have as many outlets as the groups V. Vhen the groups have twice as many selectors as groups V, then there are two junctions from each group V to each group G. If however there are twice as many groups G as there are groups V. then there is only one junction from each group V to each group G. Under these circumstances the final group L will have more inlets than outlets, for instance twice as many incoming junctions 1' and connectors than outgoing junctions t. The groups D and P can be more.I simple because the switches and junctjons of these groups are only occupiedl till `'theend of the synchronous testin". One can now assume that any desired number of junctions are engaged and nevertheless there will always be a disengaged pair of junctions /v and r. For instance from the group V2 it will be assumed that three connections have been set up and that the junctions um om, o, are engaged. Thereby the group G, is unavailable for further calls from the group V2 because c.. and c, are engaged. It will be assumed now that of the junctions r those 72M. 1x14, 11m 11.2 are engaged. Hence there will be no outlet from the groups G.. and G4 to the There therefore remains only junction c1 and the junction rm or rw. This path will be found by the synchronous testing of switches V and P in the same manner as before described.

In order to prevent any misconception let it be assumed that the junctions l0.,. um, o and 'am are engaged and likewise the junctions r2.4, rm rm, rm. The groups Gr1 and G2 vtherefore cannot be reached from the group V2 because taf-cm are engaged and the groups Grg and Gr4 cannot be reached for setting up a connection in the direction L4 because the junctions 13..., rm, rm, 11.2 are engaged. This therefore does not seem toagree with the above statement that an available pair of junctions (am) can always be found. This is however not the case because there cannot be more than four connections set up in the group V2 which according to the above assumption can be set up over the junctions ffm-rm. The arrangement according to Fie. Z therefore under all circumstances permits a free pair c. r of junctions to be found. lVhen as in the above assumption rw, rm. rm, 13 2 are engaged then a call could reach the group L, over the junctions cl2, fr, (or rm) but the connectors in the group LLl will find that the desired line tm is already engaged.

In the arrangement according to Figs. 1 and 2 the junctions /r and 7? c. r) are separately successively tested. lVhen the switches have a large number of junctions this method of testing will take too much time. ln Fig. 25 the bunching of the jnnc cu, rw are also engaged the contacts r. and lq., of relays which are not shown will be closed and earth is connected to a bus bar s1. This bus bar s. belongs to a special testing arrangement which is such. that when the preselector 'u reaches the earthed bar s1 it makes a big step over three contacts. If ina silnilar manner s2 is also earthed then the preselector makes a second big step to the junction om. In similar manner the contacts icm, JCU. 7cm are closed when the junctions r. rw, rw are engaged. When the contacts lvm, u, km are closed, earth is conY nected to the bus bar sj. If now during the testing operation the testing switch r] reaches an earthed bus bar s4 or s., it will make a large step over three contacts. lVhen the testing switch q makes a large step then the preselector u synchronously docs the saine and vice versa. The distinguishing feature of this arrangement is that junctions l.' and 7' are bunched in groups namely uw am uw. and similarly the. junctions 13,. r1H r2., going from groups (i1. (ih, (ij. in the direction to li.. arc hunched in group 1. The same holds good for all other directions.

The fundamental idea is that. strictly speaking the testing arrangements in V and l) do not test the junctions c and r but thc incoming and outgoing lines of the group (il. Connecting switches are known which first test the groups and then the individ uals in a particular group. Au obvious alternative method is to use two smaller connecting switches one behind the other such an arrangelnent being also well known and is illustrated in Fig. Lt. The incoming lines wnu., terminating in three groups of connecting switches each having three contacts. The junctions :13, .15. ar: from V, likewise terminate in three groups Y1, Y. Y1.. in connecting switches having three contacts. The junctions outgoing from the groups Y correspond to the junctions o in Fig, 3. .\s before the junctions are arranged three in a group tor instance c1. c. o3. Each junc tion c has a relay which is not shown and which closes the contact Zr when the junction is taken into use. IVheu the contacts l1.. 1., are closed, a testing a rrangemcnt s, is earthed and a switch u testing this contact will step farther from ,cl to afg. The individual testing is done by the switches in the group I'.

Fig. 4 iliagran'imatically shows switchesl having only three contacts. It is obvious that these can be replaced by au arrangement similar to Fig. 2 iu which the possibility ot' setting up connections between any subscribers is unlimited and tor this purH pose there will be more lines outgoing from the groups V and the groups Y than lines incoming. In that case the testing arrangement is particularly suitable. The lines t in Fig. 1 could be lines to other groups ot switches. For instance a system could be so builtup that the group V] in Fig. 1 is re` placed by the whole arrangement shown in Fig. 1. i. c. all the groups V. L. I). P. The lines f in Fig. 1 represent the lines r in the enlarged system. In large systems the double selecting operation will be as often repeated as circular arrangements aecording to Figs. 1. 2 or 3 are connected in series with one another. Instead of using switches having several bank contacts as shown in Fig. l. two switches having lessr contacts cau be used and these can likewise be connected in series.

Figs. 5 and t3 show by way ot' example the circuit arrangements necessary which can be `used for setting up a connection between two subscribers u2, and t4... ICach subscriber has allotted to him a preselector V and a testing' switch I). IVhen he lit'ts his receiver the line relay It is energized by current over the loop. and closes at contact 1 the circuit tor the time relay VRI. IVhen the `subscriber 'uw operates the number dial aty his instrun'ient. the motor magnet DM1 ot the testing switch I) receives impulses over the circuitlrom earth. l. VR: side switch arm sa. contact 4. DMl. battery. earth. VR2 is likewise a time relay. it closes at contact `i the circuit t'or a side switch magnet S over side switch arm an. 'The side switch maguct however only moves the arms on when it is deinergized when is again opened. this arrangement being well known. The operation ot' DM. places the arms 16. 8. 3i in contact with the bank contacts one of which is 15. The following circuit is also completed. earth. 7. t. 8. ott normal contact f) ot' the testing switch P. relay VR.. battery. earth. VR4 is energized and at its trout contactsI and 11 closes the following circuit earth. battery Bz. normal contact 12 of the contact arnrlf on testing switch P. 11. motor magnet DM. of P. relay VR... front contact 10 or after the first step o" normal switch 14 in parallel with it. coutaet 15. arm 16 of D. am, 17. junction lead 18. 19. aw, VR... DML.. of preselector V. front Contact 20 oi' VIL. arm 21. normal contact 22 of 21. battery I.. earth. rI`hcrelrv the motor magnets move the arms ot' l and V simultaneously so that 21 is now couuected to 23. instead of 22 and 1? to 2l in stead ot' 12.

The testing arrangements are .such that a disengaged lead (225 or 2l; is carthed over the back contact 2.3 anf 2001 the relays VII and VIL.. An engaged line hasv battery l, connected to it over l'ront contact 2T and battery I! over front contact 2S. The testing switches Y and I will continue to move till both simultaneously reach a -liseugagcd contact in which case tl'ieret'orc both the leads 2li and 2l will be i'liscugfxiged. It' both the leads 22') and 2l are simultaneusly occu" pied by other switches. the motor magnets will be operated by the batteries lI and I1. connected in series. It' howevei"onl.\ one olI these leads is `l'ree the battery li, or ItI is sufficient to operate thc switches. A\s-uminj f now that the switches V and l ha re simultaneously reached lines both ot' which 22 and 2l are disengaged. the circuit tor DIL. VIL. VR... DM.. is then opened. IVheu VII, is dcenergized it opens contact 2H and thereby opens the circuit ot' S. The side lswitch arms are now moved ,into position three. Thereby the connection betwemi the preselcctor and thc testing switch l over the junction lead 1H and the selector D is broken. lfurY ther the speaking leads a and /1 are switched through at i1 and 41; owing to tbe de energizing of VR; the contact 3l) is opened and therebv the holding circuit ot' the rclaj. VR, over trout contact 'l is opened at con tact Bt). VN. releases its` armature and at back contact 22 prepares a release cucut for testing switch l. .\t the arm BIS ot' l) .fue circuit of an auxiliary relav lli is {flow-d over the oil' normal switch 3i al' I). "llico III( will etlect the release ol` teseating .switch l) as described later on. Over the back contact X5 ot' VII,` and thc front contact lo oz" VRI the circuit for the tinu` relay VI?. is closed. VIL at its trout contact 2T puts thc engaged test on the lead 23S by connecting ii to battery It.. The subscriber M now again operates his number dial and sets the selector (IH on the same contact as thc testing switch I). it' t'or instance the testing switch I) has been set on the fourth contact then selector (l will likewise be set on the fourth contact. IVhile these number impulses are being sent the side switch magnet S is ener-Y gized over contact 354 and an. The current impulses for setting selector (I'H pass ovefl the following circuit: earth. it). o'. 41. +2. 2. 44, relay R1. 46. battery. earth. By each im pulse the contact 2 is closed and thereby the motor magnet DNLl energizet At the tiri-f.

f' 5) disconnects earth time relays VRT, and VR, are

impulse the energized. During the transmission of the impulses VR, opens contact 70 and contact 45, whereby it prevents the test relay PM1 being energized during the movement of the selector GW. At the end of the impulse series the relays VR7 and V Rm become deenergized thc latter first, as VRT is slower acting. Thereby the relay VR7 holds the contact 7() in the circuit of the relay VR, opened so that the testrelay PM, is energized and opens the contact 46' in the circuit of the relay VRN befoi'e the contact 7() is closed upon the denergization of relay VRT. 'lhus the motor magnet MD4 also cannot be again energized upon closing the oli' normal contact ($9. its circuit being broken at the contact 46. The relay PM, opens the contact 46 and denergizes the relay R1. At the end of the impulses after selector Gm has been set the contact 5 is opened and thereby breaks the circuit of S. thereby moving the side switch arms into the fourth position.

As soonas the side switch arms (s) reach the fourth position the following cii'cuit is closed; earth. U, 473.3111, 16, 15, 14, VR. DM, 32, 48, battery, earth. The testing switch P will move o-n till it reaches its normal position whereupon the contacts 48 and l4 are opened. When the normal position is reached contact 34 is also opened and thereby circuit for the auxiliary relay HR is opened. HR is denergized and at 50 completes the circuit of the motor magnetA DM1 of testing switch 1) as follows: earth, battery, DM,. 8V, 49, 50, off normal switch 5l, interrupter U', earth. When th selector reaches its normal position switch con tact 5l is opened and the selector comes to rest.

As soon as the selector has picked out a connector LW (Fig. 6) therelay C at the latter is energized and at 52 closes the circuit of the motor magnet DMD. Furthermore the relay C closes` the contact 37, whereby a circuit for the relay VR, is closed over earth, battery, VR6, rm', 37, earth. Upon energization of the relay VR,s (Fig. from the lead 24 by opening the back contact 2 and connects battery B2 on the contact 28 to the lead 24. Thereby the circuits of the motor magnets MD2 and MD of any other testing switches are closed as already mentioned. Iinpulses are now again sent by the calling subscriber u2, through relay R andare repeated over DM., and VR the circuit being: earth, 39, 40, a, 41,' 42,'43, gvl. 52, DMB, VR, battery, earth. V R'closes contact 53 and thereby completes the circuit of side switch magnet S1. opened and the more into-the second position in which the testing relay P2 is at s'w connected to the4 the releasing circuit of M. of the time magnet VR, is opened, but VR',

'63. The relay Pi .At the end ofthe impulses 53 isagain side switch arms .sx-iivu4 test arm of the connector for the purpose of'testing the wanted subscribers line.

Assuming first that the wanted subscriber t4, is disengaged, P.l will be energized and at 54 and 55 connects the special leads through and at contact 56 connects the interrupter U2 to the side switch magnet S1 over contact 57 of the side switch arm sl. Thereby the side switch arms are moved to the third position in which the circuit of ringing relay LR is closed: earth, batter 58, sm, 59, LR, interrupterY Sch, eart lLR is periodically energized and when thus energized it, at its front contacts of `60 and 61 connects ringing current to the line.

`When the wanted subscribed t4, answers the call the line relay Y is energized and opens contacts 58, 63 and 66 and closes contact 62. At the back contact of 58 the circuit of ringing relay LR is opened, at 62 VR, is energized which at 64 prepares the releas- Ying circuit for the selector Gm.

At the end of the conversation the two subscribers u2, and t4, hang up their receivers. Assuming that the wanted subscriber hangs up before the calling subscriber the circuit alterations will then be as follows:

Relay Y is denergized and at 66 completes retains its armatures for a short time so that contact 54 does not open immediately and currentvtherefore flows from earth, battery, 67, M, 54, 66 to earth, and the connector LW is thereby released. The relay Y at 63 connected earth to the lead 65 over 68, 64, and G is therefore short circiiited, and releases its 'armature which at 46 closed the circuit z' earth, battery,DM VRN, '70, 46', 69, interruptor, earth. The time relay VR, beingv energized prevents the energization of relay P1 by opening its contact 45 thereby disconnecting earth from 1)., and the. test arm of the selecton Gm while the latter is moving over '-thebank contacts. The selector Gm' its motor magnet DM until it reaches its norii'ial position, whereupon vthe olf normal switch 69 and thereby thecircuit of DM, and VR, is opened. subscriber U24 hangs u p his receiver relays R and VR1 will in succession be denerized. The relay VR1 closes the contacts 7 2f and 7 4. At 72 the circuitfor motor magnet DM2 and VR3 is closed from earth, batteryV 73, 72', DMZ, V'Ra, sw, '75,?, U4, earth. Thereby the preselector V is rotated till' 1t reaches its normal position whereupon the contact 7 3 is opened and the circuit of ,DM2 thereby opened.l l y As soon Athe lpreselector` V reaches its normal position .its off normal contact closes the magnet Nyeai'th, battery, N.,`7 6 (which is closed 'as soon as the side switch-.9 leaves its` 130" At 62 the circuit is rotated by When now the calling following circuit for the release normal position) T4. 77, earth. The side switch s may only be released after the preselector V has reached its normal position. otherwise the circuit of motor magnet DM2 will be opened at of snin which case the selector arms could not be moved hack to their noi'iiial position. It will now be as sulned that the wanted sullsci'ihei"s lille is engaged aild that therefore the relay l2 is not energized. ln that case the side switch of the connector IV remains in its second position with the busiv hack buzzer connected to the lead /l at contact 78 of NK when the calling subscriber hears this signal he hangs tip his l'eceiver. TherebyT owing to the release of l a single impulse is sent from eai'th ovel' 3S). Yt0. o. l1. l2 lil. .vw 52. D3, VIL. battery. eai'tli. YK, is energized and at 79 closes the circuit of the release magnet M so that the colinector is released. At ($4 earth is connected over Sl. SH. til. Uli. to the lead tl so that as before explained the selector 91" is likewise released.

ln the specification and claims the expression "lines" also groups of lines may be understood in case the telephone s'vstelii is largeenough to use groups. lil the saine manner called lines` aiid trunk lines" are included in the terni called lines.

llaviingr explained my invention. what l do claim and desire to secure by Letters latent is:

1. ln an aiitolliatic telephone exchang,e` calling lilies, called lines, trunk lilies. devices for selecting said called lilies. other devices for selecting said tl'unlv lilies. alid means for testing said truillv' lilies before said trunk se lectilig devices select one of said trunk lilies.

2. ln an autolilatic telephone, exchange. calling lilies. called lines.ltrtinlt lilies leading to said called lilies. devices for selecting said trunk lines leading to called lines. alid lneaiis for testing said lilies leading to called lines available for the selecting devices bcfore the latter select a trunkV line.

3. ln an automatic telephone exchange, calling lines. called lilies. trunlv' lines. electroinagneticall v operated selecting devices. adapted to be set upon trunlv' lines leading to called lines. and means for testing said trank lines leading to called lilies available for the selecting devices before the latter select a trunk lille.

4. lili an automatic telephone exchange calling lilies. called lilies. trunk lilies selecting devices adapted to be set upon ti'unh lilies leading to ealltxl lilies, ineans for testing said trnnh lines before they are selected b v the selecting devices.` and means for connecting a calling line with said selecting di vices.

3. lli an automatic telephone exchange calling lines, called lines, trunk lilies. select ingr devices adapted to be set npon trunk lines leading to said called lines, illeans for testing said t`l'iilil\v lilies before tliev arc se lccted b'v the selecting devices. no3-an` t'ol connecting` a calling line with `aid `electing devices` and incans for disconnecting the testing means from a tl'unlv' lilnleading to called lines after testing.

t'. ln an autolnati;A telt-phono exchange. calling lilies. called lines. ti'unll de vices for selecting said called lino. ottici de\ices for selecting said ti'iiiiiv' lines. inczins l'ol' testing said trunk lines4 before the)` arc selected by the said selecting devices. and nicans for connecting a calling' lintl 'v'. itn one of the said t'i'uiil.V selecting dci ices.

i'. ln all automatic telephone exchange calling lilies. called lines. ti'uulf lines. lecting devices adapted to be .set upon vsaid trulilv' lines. said selecting devices being an ranged in groups. and incansl for testing the outgoing trulilv' lines` of said group` lic-tore thev are selected by said selecting dei. icef.

ln an automatic telephone exchange calling lines. called lines. trunk lilics. groups of selecting devices adapted to be sci upon said trunlv' lines, means for testing `aid trunk lilies of said groups beloietliev are selected by the selecting device. and means for connecting a calling line with one ot` the selecting devices in said groups.

fl. In an automatic telephone exchange calling lines, called lilies. trunk lines.y groups of selecting devices adapted to llc set upon said trunk lilies. means for testing said trunk lines of said groups before they are selected b v the selecting devices. means for connect-- ing a calling line with one of the selecting devices. ill said groups, and llicalis arranged on the calling lille to operate said selecting devices.

1t). lli an automatic telephone exchange. calling lines. called lilies. selecting devices. nieans.for testing lilies ontgoing troni .selecting devices before they are selected bv the .selecting devices, said testing nicans lli-ing operated independently of said selecting de vices.

ll. ln an automatic telephone exchange, calling lilies. called lilies. .selecting devices. lncalis for testing the outgoing lint-.sl before liiics.

selected bv thc selecting devices. and nl'ans for connecting the called lilies with said selecting devices.

lf2. Ill an autoliiatir telephone e.\clcalling lines. called lines, selecting t and indcpeiidelill)v nioiairle svlitclie4 as testing means.

13?. ln an autoliiatic telephone evilaligc. calling lilies. called lilies. selecting device-v pri-selective switches controlled tin cali ingl lines. capable o," connecting a calling linc n itli the selecting de iccrv and iiidcprnd el'itlv ulovable switches acting as testing uieans.

lil. In an automatic telephone exchange. calling lines, called lines. selecting` devices,

llt)

' means bein preselective switches, lines arranged between the preselective switches and the selecting devices, trunk lines leading from the selecting devices to the called lines and means for testing said trunk lines, before they are selected by preselective switches and selecting devices respectively.

15. In anautomatic telephone exchange, calling lines, trunk lines, selecting devices for selecting said trunk lines, preselective switches controlled by the calling lines, capable of connecting a calling line with the selecting devices and independently movable switches acting as means for testing said trunk lines leading to called lines.

16. In an automatic telephone exchange, calling lines, selecting devices, preselective switches trunk lines arranged between said selective switches and said selecting devices, trunk lines leading to the called lines, means combined with said preselective switches for testing said trunk lines arranged between said preselective switches and said selecting devices, and means arranged independentl; of any said switches for testing said trun lines leading t0 the called lines.

17. In an automatic telephone-exchange, calling lines, called lines, selecting devices, preselective switches, trunk lines arranged between said preselective switches and said selecting devices, trunk lines leading to the called lines, and means being 'arranged independently from any of said switches and selecting devices, for testing said trunk lines leading to the called lines, having as many testing positions as there are trunk lines.

18. In an automatic telephone exchange, calling lines, called lines, selecting devices, preselective switches, trunk lines arranged between said preselective switches and said selecting devices, trunk li'nes leading to the called lines, means combined with said preselective switches for testing sa'id trunk lines arranged between said preselective switches and said selecting devices, having as many testing positions as there are trunk lines, and arranged independently from any of sai switches and selecting devices for testing the trunk lines leading to the said called lines, having'as many testing positions as there are trunk lines.

19. In an automatic telephone exchange, calling lines, called lines, selecting devices, preselective switches, trunklines arrange between said preselective switches and said selecting devices', trunk lines leading'to the calledl lines, means for testing said trunk lines@ larranged between said reselectivc switches and said selecting devices, means to# testing said lines leading to the called lines, and means for operating the selecting devices independently of said testing means.

In an automatic telephone exchange, calling lines, called lilies, selecting devices, preselective svitches, trunk lines arranged between said preselective switches and said selecting devices, trunk lines leading to the called lines, means for testing said trunk lines arranged between said preselective.,y

switches and said selecting devices, means for testing the trunk lines leading to the called lines, both said testing means being branched off in multiple from said calling lines, and controlled by the `calling lines.

21. In an automatic telephone exchange,

calling lines, called lines, selecting devices, preselective switches, trunk lines arranged between said preselective switches and vsaid selecting devices, trunk lines leading to," the called lines, means for testing lines arranged between said reselective switches and said selecting devices, means for testing said trunk lines leading to the calledl lines, both said testing means being arran ed in multiple, and means whereby S5 one kind of said testing means is controlled by the other while operating.V

22. In an automatic telephone exchange,

calling lines, called lines, selecting devices, preselective switches, trunk lines of lines arranged between said preselective switches and said selecting devices, trunk lines leading to the called lines, means for testing said trunk lines arranged between` said preselective switches and said selting devices, means for testing said tr k lines leading to the called lines, and mea s whereby both kinds of testing means are operated synchronously.

23. In an automatic telephone exchange,

calling lines, called lines, selecting devices, preselective switches, trunk lines arranged between said preselective switches and said selecting devices, trunk lines leading to the called lines, means for testing saidytrunk lines arranged between said preselective switches and said selecting devices, trunk lines leading to the called lines, means for testing Said trunk lines arranged between said preselective switches and said selecting lio devices, means for testing said trunk lines leading to the called lines, and means, Whereb both kinds of testing'means are stoppe synchronouslywhen moving.

24. In an automatic telephone exchange,

selecting devices,

calling lines, zcalled lines, incoming trunk lines leadin from said calling lines to the selecting evices, outgoing trunk lines leadin from the selecting devices to said call said incoming trunk lines, means adapted for testing said outgoing trunk lines, both said testing means being arranged in multiple, and means for intel-ru )ting the move nient of both said kinds o when both testing means have found an available respective line.

25. In an automaticv telephone exchange, calling lines arranged in groups, called lines arranged in groups, selecting devices arv 130 saidv trunk 80 or grolups 9 lines, means for testing testing means,

ranged in groups. trunk lines between each oit' said groups of calling lilies and each ot said groups ot' selecting devices. other truiilt lilies between each oic said groups ot' select ing devices aiid each ot said groups ot' called lines.

' ln an automatic telephone exchange. caliiiig lines arranged in groups, called lilies' arranged in groups, selecting devices arranged in groups. truiili lilies between cacli otk said groups of calling lines and each ot' said groups of selecting devices. other trunk lines between each of said groups ot selecting devices alid each ol said groupe. ot' called lilies. testing liieaiis for testing said latter trunk lilies arranged in groups separated from any ol' said other groups and testing lilies between said groui'is ot testing nieans and said groups ot called lilies. whereby all testing lilies outY goingv troni one ot' said groups ot' testing iiieaiis are incoming testing lilies at one ol' said groups ot' called lines.

1li an'automatic telephone exchange. calling lilies. called lines, selecting devices. trunk lilies leadingrtp called lines independent switches for testing the latter lines. and final selecting llieaiis arranged in groupsbetween the trunk lines alid the called lilies.

2H. in an autoli'iatic telephone exchange. failing lilies. called lilies, selecting devices. trunk lilies leading to called lines independenti;Y nio*v able switches for testing the latter lines. filial selecting means arranged iii groups between the trunk lines alid the called lilies. said testing means liavilig as liiany testing`positioiis as there are trunk lilies between the selecting devices and the corresponding group `ot said filial selecting ilieaiis.

29. In an automatic telephone exchange. callingy lines, called lilies. selecting devices.y preselective switches trunk lines leading to called lines. independently movable switches for testing the latter lines, and final selectn ing nieaiis arranged between the trunk lilies and the called lilies.

di?. In an automatic telephone exchange. calling lilies. called lines, selecting devices. prcsclieclive switches trunk lilies leading to iiilled lines. independently movable switches i'or testing the latter lilies. tilial selecting nii-ansy arranged between said trunk lines and the called lines and operated by iniiiiilscs sent over the calling lilies.

i 31. ln an autoiiiatic telephone exchange. calling lilies. called lilies selecting devices. pref-elective `switches trunk linesl connecting said preselective switches with said selecting devices. independently lliovable switches tor tcstLng said Iiulill lilies. trunk lines connecting said selecting devices with called lilies and independcntly iliovablc switches for testinirbe latter truiilt lilies7 aiid tiiial selecting means arranged between the lattcr trunk lilies and the calledliiies.

"2. Yln an automatic telephone exchange. calling lines, called lilies. selecting devices. lneaiis toi' testing lines outgoing troln said selecting devices before they are selected by the selecting devices. alid iiieans for coiliiecting` the calling lilies with said testing means.

33, Iii an automatic telephone exchange. calling lines. called lines. selecting devices, iiiealis .for testing lilies outgoing troni the .selecting devices before they are selected by the selecting devices. means for connecting the calling lilies with said testing nieans7 aiid iiieans tor disconnecting said testing liieans from a calling lille after testing.

PH. ln an autoinatic telephone exchange. calling lilies. called lines. selecting devices. lneans lor testing the lilies outgoing from said selecting devices before they are selected by the selecting devices, lneans for connecting the calling lines with said testing ineans. said coiiliectilig means consisting of electrolnagnets alid lnovable contact fingers driven by said magnets.

255. Vlli an automatic telephone exchange. calling lines, called lilies. selecting devices. in ans for testing lines outgoing troni said selecting devices before they are selected by the selecting devices. means for connecting the calling lilies with said testing ilieans` said connecting lneans consisting ot eleetromagnets alid movable contact fingers driven by said magnets and being operated by impulses controlled by the calling line.

3G. In an automatic telephone exchange, calling lilies, called lilies. trunk lilies lead ing,r to said called lilies selecting devices. means adapted for testing said trunk lilies, means for connecting the testing means with calling lines, iiieans for connecting calling lilies with said selecting devices. means for connecting said selecting devices with said trunk lines leading to called lilies. means for disconnecting said testing means from sid calling lines alid mealis for disconnecting saidqcsting means troni said trunk lilies leading to called lilies.

37. lli an automatic telephone exchange, calling lines. called lilies. trunk lilies lead* ing to said called lines. selecting devices. preselective switches. means adapted .for testing said trunk lilies. means for connecting the testing llieaiis with calling lines. iiieans for conlimting said preselective switches with said selecting devices.l iliealis for coiilicctii-ig said selecting devices with said trunk lilies. leading to called lilies. ilieaiis tor disconnecting said testing means troni said calling'lincs alid means tor disconnecting said testing viiieaiis troni said trunk liliesI lcadilig to called lilies.

It.. lli an automatic telephone exchantfge7 calling lines, called lines, selecting devices, means for testing lines outgoing from the selecting devices, before they are selected by the selecting devices, means for connecting the calling lines with said testing means and means for connecting the called lines with said selecting devices.

il?. In an aule-matic telephone exchange, calling lines, called lines, selecting devices, preselective switches, means for testing the lines outgoing from the selecting devices, before they are selected by the selecting devices, means for connecting the calling lines with said testing means and means for connecting the called lines with said selecting devices.

40. ln an automatic telephone exchange, calling lines, called lines, selecting devices, prcselective switches, means for testing the lines outgoing from the selecting devices be tore they are selected by the selecting devices, means for connecting the calling lines, with said testing means, and controlled by impulses sent over the calling line, and nieans for connecting the called lines with said selecting devices.

Ltl. In an automatic telephone exchange, calling lines, called lines, selecting devices, preselective switches, means for testing the lines outgoing from the selecting devices before they are selected by the selectiiw dcvir. means for connecting the callingzlines with said testing means and controlled by impulses sent over the calling line., said testing means being operated ii'nlcpci'identl v of said selecting devices and said connecting means, means for connecting the called lines with said selecting devices, said selecting dcvices being operated iinlependently of said preselectivc switches.

il?. ln an automatic telephone exchange, calling lines, called lines., selecting devices, preselectivc switches. means for testing the lines outgoing from the selecting devices bcl'ore theyy are selected b v the selecting def vices, means for connecting the calling lines with said testing means, trunk lines connecting said selecting devices with called lines. linal selecting means arranged between said trunk lines and the called lines and means for connecting a calling line with one el the selecting dern 5?. ln an automatic telephone exchange, railing lines, called lines, selecting devices, presr-leetive switches meanstor testing the linesv outgoing from the selecting devices be tore theiv are selected by the selecting devices, means for connectingy the calling lines withA said testing means, trunk lines connecting said selecting devices with called lines, linal selecting means arranged between said trunk lines andthe called lines, and

means for connecting a calling line with onev of the selecting devices, said connecting means being operated independer,y f' of the calling lines.

4l. .ln an automatic telephone i bange,

calling lines, called lines, selecting devices, trunk lines arranged between said selecting devices and said called lines, means for testing said trunk lines before they are selected by the selecting devices, said trunk lines being arranged in groups and subgroups.

45. ln an automatic telephone. exchange, calling lines, called lines, selecting devices, preselective switches, trunk lines arranged between said preselective switches and said selecting devices in groups and subgroups, trunk lines arranged in groups and subgroups between said selecting devices and said called lines.

46. In an automatic telephone exchange, calling lines, called lines, selecting devices, preselective switches, trunk lines arranged between said preselective switches and said selecting devices in groups and subgroups, trunk lines arranged in groups and subgroups between said selecting devices and said called lines, whereby each of said subgroups of the lines arranged between said preselcctive switches and said selecting devices corresponds to a subgroup of the said trunk lines arranged between said selecting devices and said called lines.

47. ln an automatic telephone exchange, calling lines, called lines, selecting devices, trunk lines arranged between said selecting devices and said called lines, means for testing said trunk lines before they are selected by the selecting device, the trunk lines being arranged in groups and subgroups, and means for testing said subgroups of trunk lines.

4S. In an automatic telephone exchange, calling lines, called lines, selecting devices, preselective switches, trunk lines arranged between said preselective switches and said selecting devices, trunk lines arranged between said selecting devices and said called lines, means for testing said trunk lines before they are selected by the selecting devices, said trunk lines being arranged in groups and subgroups and means for testing said subgroups of said trunk lines, be fore they are selected by the selecting den vices.

49. In an automatic telephone exchange, calling lines, called lines, selecting devices, preselective switches, trunk lines arranged between said preselective switches and said selecting devices, these trunk lines being ai ranged in groups and subgroups, independently mov able switches, for testing said lines and said subgroups of trunk lines, trunk lines arranged between said selecting devices and said called lines, independently movable switches for testing said trunk lines, said trunk lines being arranged in groups and subgroups and independently ymovable switches for testing said subgroups of said connecting lines.

50. In an automatic telephone exchange, calling lines, called lines, selecting devices. preselective switches, trunk lilies arranged between said preselective switches and said selecting devices, these lines being arranged in groups and subgroups, means for testing said lilies and means for testing said slibgroups of lines. trunk lines `ar'anged between said selecting devices and sind called lilies, means for ytesting said trlplk lines. said trunk lilies being arranged in groups and subgroul'is, means for testing said subgroups ot' said trunk lilies, and means, whereby said means for testing said trunk lines or said subgroups of lilies arranged between said preselective switches and said selecting devices and those means for testing the trunk lines or said subgroups of lines arranged between the preselectivc switches and the called lilies respectively z re operated synchronously.

51. In an automatic telephone exchange, calling lines, called lines, selecting devices, selective switches, trunk lines arranged between said preselective switches and said selecting devices, these lines being arranged in groups and subgroups, means for testing said subgroups and lilies consisting of automatically moved switches, connecting lilies arranged between said selecting devices said trunk lines being and said called lines,

arranged in groups and subgroups. and means for testing said subgroups and lines consisting of automatically moved switches.

52. In an automatic telephone exchange, calling lines, called lines, selecting devices, presclective switches, trunk lines arranged between said preselective switches alid said selecting devices, these lines being arranged in groups and subgroups, means for testing said subgroups and lines consisting of automatically moved Switches, trunk lines arranged between said selecting devices and said called lines, said trunk lines being arranged ill groups and subgroups, means for testing said subgroups and lilies consisting of automatically' -nloved switches, whereby both kinds of automatically moved switches are operated synchronously.

53. In an automatic telephone exchange, callingr lines, called lines, selecting devices, preselective switches, said preselective switches arranged in groups, trunk lilies ar ranged between said groups of preselective switches and said selecting devices, final selecting devices arranged in groups, trunk lilies arranged between said selecting devices and said groups of final selecting devices. means adapted for testing the latter trunk lines before they are selected by said s lect-- ing lievices. and tbc arrangement ol the trulilv lines in such a way` that the number of said trunk lines between said group` ol' preselective switches and said sclccti l' dev vice.` lid between said selecting devi Ves and sani groups of tinal selec-ing devices le spel-tively is equal er greater than the amount ot calling lilies or called lilies rcA specrivelv.

5l. Vln ail automatic tilepliolie exchange, calling lilies, called lines, selecting devices. pl'esclcctive switches. inal selecting devices. trunk lilies arranged between said preselcctive switches and said selecting devices. trunk lines arranged between said selecting devices alld said final selecting devices, nica. s adapted for testing tbe latter tlunll li*l cs bel'ore they are selected by said select# ing devices. the arrangement ill such :l way. that tile nunbei' of said preselectivc switches or sei ctilig devices or linal selecting devices respectively is equal or giwatcr than the amount ot' said calling lines.

53. lil an automatic telephone exchange. calling lines. called lines, selecting devices, preselective switches. said picseleetive switches arranged in groups. trunk lilies arranged between said groups ot iireselective switched alid said selecting devices. final se lectllig devices ailai'lged in groups, trulili' lilies arranged between said selecting devices, and said groups oic lnal selecting devices, means for testing the latter trunk lilies before they are selected by selecting devices, and the arrangement ot the tl'lllill lines and thc preselective switches and the selecting devices and the final selecting deY vices in such a way, that the number of said trunk lilies between said groups of preselectivc switches and said selecting devices or between said selecting devices and said groups of l'inal selecting devices or of said preselectivc switches or selecting ilcviecs or final selecting devices respectively is equal or greater than thc amount otl said calling lilies or called lilies respectively.

ln witnesses whereof, l hereunto subscribe in v name in the presence oi two subscribing witnesse;; thisl ltltli day of January', i913,

AnoN Kl/vra lVi tnesses HENRY HAsPER, VOLDEMAR HAUPr. 

